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Motivation ---------- Current implementation does not allow to specify any formatting. It even cannot output log level, because `writeln()` accepts `varags[string]` and silently ignores everything before last argument. Modification ------------ Perform formatting in the single place during substitution. Make log level optional as all other substitution variables. Also make verbose logging more informative and parseable. Result ------ Correct handling formatting and substitutions. Machine-friendly default output of verbose logger.